I have Huawei MediaPad tablet. I saw in it specification that it supports GSM network. But I cannot find application to make phone calls. When I inserted SIM card and called to my phone, the call was terminated without notifications or reasons.

1 Answer
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The fact that a device supports GSM networks doesn't mean it has call capabilities. I own a Samsung Galaxy Tab 10.1 which also has GSM capabilities but no calling. The GSM chip is just used for mobile network data and SMS services.